One of the great lies of my childhood was "Don't worry about hayfever, you'll grow out of it."
I never did. Indeed as I got older I saw more and more people begin to suffer from it - perhaps indicating a link to pollution? Tablets have proved broadly useless, except of course for improving the share prices of various pharmaceutical companies. The only real cure I have ever had is spending time at the seaside - sea air cures all!
One thing thing that helps is Olbas Oil. Also, if you can find it, do try Olbas Bath - which as the name suggests is a bath foam based on Olbas Oil. Some health shops in London certainly stock it, and you can order it on-line here.